Basic Electrical Engineering MCQs (Part-10)

What is the SI unit of electric potential difference?

A Ampere
B Ohm
C Volt
D Watt

Which of the following factors affects the inductance of a coil?

A Number of turns
B Length of the coil
C Material of the core
D All of the above

What happens to the impedance of an AC circuit with an inductor as the frequency increases?

A Impedance increases
B Impedance decreases
C Impedance remains constant
D Impedance becomes zero

Which electrical quantity is measured by a galvanometer?

A Voltage
B Current
C Power
D Resistance

What type of current is produced by a battery?

A Alternating Current (AC)
B Direct Current (DC)
C Pulsating Current
D Static Current

What is the role of a commutator in a DC machine?

A To generate current
B To convert AC to DC
C To ensure unidirectional current
D To step up voltage

Which device is used to measure alternating current (AC) and direct current (DC)?

A Multimeter
B Galvanometer
C Wattmeter
D Oscilloscope

What happens to the resistance of a conductor if its length is doubled?

A Resistance doubles
B Resistance is halved
C Resistance remains the same
D Resistance becomes zero

What is the primary function of a choke in a tube light circuit?

A To step up voltage
B To limit current
C To convert AC to DC
D To increase resistance

Which of the following is an application of Ohm’s Law?

A To calculate resistance in a circuit
B To determine the power consumed by a device
C To measure energy
D To step up voltage

What is the primary material used for electrical wiring?

A Aluminum
B Copper
C Steel
D Iron

What is the purpose of an electrical diagram?

A To measure current
B To visualize the connection of components
C To regulate voltage
D To reduce power loss

Which safety device is designed to trip when a ground fault occurs?

A Circuit breaker
B Residual Current Device (RCD)
C Fuse
D Transformer

Which law governs the relationship between magnetic flux and induced EMF?

A Ohm’s Law
B Faraday’s Law
C Kirchhoff’s Law
D Coulomb’s Law

What happens to the total resistance in a parallel circuit as more resistors are added?

A It increases
B It decreases
C It remains constant
D It becomes zero

What type of current flows in both directions periodically?

A Alternating Current (AC)
B Direct Current (DC)
C Pulsating Current
D Static Current

What is the purpose of using a step-down transformer?

A To increase voltage
B To decrease voltage
C To store energy
D To regulate current

Which device protects electrical appliances from voltage spikes?

A Circuit breaker
B Surge protector
C Fuse
D Resistor

What is the unit of electrical power?

A Volt
B Ampere
C Joule
D Watt

Which device is used to measure high voltages?

A Multimeter
B Voltmeter
C Megger
D Potential Transformer